Chromatic dispersion compensating optical fiber

A single-mode chromatic dispersion compensating optical fiber for a wavelength multiplexing transmission network, having a chromatic dispersion C at a central wavelength of a spectral band used which is less than −50 ps/nm-km, having a chromatic dispersion slope C′ at said central wavelength which is negative, having a ratio of chromatic dispersion to chromatic dispersion slope C/C′ at said central wavelength which is less than 600 nm, successively comprising, from the center towards the periphery, a core having a variable index profile, then a cladding of constant index, characterized in that the variable index profile of the core comprises at least six slices (1 to 6) among which successively from the center towards the periphery,

• a central slice (1) whose maximum index is greater than the index of the cladding, the difference Dn1 between the maximum index of the central slice and the index of the cladding being greater than 13.10−3,
• a first burried slice (2) whose minimum index is lower than the index of the cladding, the difference Dn2 between the minimum index of the first burried slice and the index of the cladding being less than −4.10−3,
• a first annular slice (3) whose maximum index is greater than the index of the cladding and less than the maximum index of the central slice, the difference Dn3 between the maximum index of the first annular slice and the index of the cladding being greater than 2.5.10−3,
• a second burried slice (4) whose minimum index is less than the index of the cladding, the difference Dn4 between the minimum index of the second burried slice and the index of the cladding being less than −2.10−3,
• a second annular slice (5) whose maximum index is greater than the index of the cladding and less than a maximum index of the central slice, the difference Dn5 between the maximum index of the second annular slice and the index of the cladding being greater than 2.10−3,
• a third burried slice (6) whose minimum index is lower than the index of the cladding, the difference Dn6 between the minimum index of the third burried slice and the index of the cladding being less than −1.10−3.